Charger reports overvoltage on AC input; app or local display shows line voltage too high; charging is disabled.

Warning: Overvoltage can damage the charger and vehicle. Do not bypass this protection.

• Step 1 – Measure supply voltage:
  • With a multimeter and appropriate PPE, measure line-to-line voltage at the charger's input terminals (qualified person only).
  • Compare to the charger's rated input (typically 208–240 VAC). If consistently above spec, contact your utility or electrician.
• Step 2 – Inspect panel connections:
  • Have an electrician check for loose lugs, corroded breakers, or shared neutrals causing voltage imbalance.
  • Correct any wiring defects.
• Step 3 – Power cycle and retest:
  • Turn OFF the breaker for 2 minutes, then turn it back ON.
  • Check if the error clears and the charger resumes normal operation.
• Step 4 – Internal sensing fault:
  • If measured voltage is normal but the charger still reports overvoltage, the main control board voltage sensing circuit may be defective.
  • Contact ChargePoint support or an EVSE technician to replace the control board.